Dimensional evolution of spin correlations in the magnetic pyrochlore Yb2Ti2O7 Academic Article uri icon

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abstract

  • The pyrochlore material Yb2Ti2O7 displays unexpected quasi-two-dimensional (2D) magnetic correlations within a cubic lattice environment at low temperatures, before entering an exotic disordered ground state below T=265mK. We report neutron scattering measurements of the thermal evolution of the 2D spin correlations in space and time. Short range three dimensional (3D) spin correlations develop below 400 mK, accompanied by a suppression in the quasi-elastic (QE) scattering below ~ 0.2 meV. These show a slowly fluctuating ground state with spins correlated over short distances within a kagome-triangular-kagome (KTK) stack along [111], which evolves to isolated kagome spin-stars at higher temperatures. Furthermore, low-temperature specific heat results indicate a sample dependence to the putative transition temperature that is bounded by 265mK, which we discuss in the context of recent mean field theoretical analysis.

authors

  • Ross, KA
  • Yaraskavitch, LR
  • Laver, M
  • Gardner, JS
  • Quilliam, JA
  • Meng, S
  • Kycia, JB
  • Singh, DK
  • Proffen, Th
  • Dabkowska, HA
  • Gaulin, Bruce D

publication date

  • November 30, 2011